MWNN is not yet home. He phoned last night, having just crossed the channel, to say that he'd forgotten to close the outflow valve on the sea-toilet and asking what he should do. I advised that to avoid many sleepless nights, he should return to the boat, which he did on the same train from which he'd just disembarked. A late-night text reassured me that the boat was still afloat.

A costly mistake (financially, physically, and emotionally) which could have been much more expensive had the boat sunk.